If somebody has a 300' well, how long would it take for any pesticide to even reach the well water. I have no clue, but I would think it would take at least a 5 years. Wouldn't the pesticedes be pretty weak by the time they leached through the soil and ledge. This is not to say that I am not worried about over use. Just wondering. I have a well and still try not to spray all that much. Anybody have any insight on the subject.